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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

213285 puzzles downloaded.

13 8     9             11   10 2  
16                 4 10 2   9 1  
9 2     7         8     13      
      14 11 2 13   15              
14 9 3     7     8       11      
    11 5 12     3                
15 4   10   13                    
          10 11       9         5
1         4       5 11          
                    12   7   4 9
                16     8 5 11    
      4       11     6     3 10 16
              14   13 15 4 12      
      12     7         16     5 4
  10 15   8 12 16                 11
  16 5   1             6     15 13
Showing puzzle number: 264
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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